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Parameters influencing the spray behavior of waterborne coatings / Lin-lin Xing in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 890 (03/1999)
[article]
Titre : Parameters influencing the spray behavior of waterborne coatings Type de document : texte imprimé Auteurs : Lin-lin Xing, Auteur ; J. Edward Glass, Auteur ; Raymond H. Fernando, Auteur Année de publication : 1999 Article en page(s) : p. 37-50 Note générale : bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique)
Dépôt par pulvérisation
Gouttelettes
Latex
Revêtements en phase aqueuse:Peinture en phase aqueuse
Rhéologie
Système de pulvérisation (technologie)
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : The influence of liquid pressures and orifice diameters on the sprayability of non-Newtonian, waterborne latex coatings, that vary in latex particle size and thickener composition are examined in this study. It is observed that the higher the dynamic uniaxial extensional viscosities (DUEVs, ηe) of the coatings, the larger the Sauter mean diameters (SMDs) of the spray droplets and the broader the droplet size distributions. The shear viscosities at high shear rates and the parameter reflecting shear elasticity, the storage moduli, at low deformation rates do not correlate with the droplet sizes and the distributions observed. In addition to these observations, the Sauter mean diameters of spray droplets decrease with increasing spray pressures and with decreasing orifice diameters; however, with increasing pressures, pulsations in the fluid due to turbulence create areas of high and low droplet density.The relationship of the SMD to orifice diameters using fan nozzles is defined by the relationship:[FORMULA]The experimental results associated with each of these parameters are discussed in the text. Note de contenu : - EXPERIMENTAL SECTION : Formulation of latex coatings - Airless spray process - Measurement of droplet size and their distribution in spray coatings - Rheology measurements
- RESULTS AND DISCUSSION : The effect of orifice diameters on SMDs of spray droplets - Derivation of parameter dependent equation for latex coatings sprayed by airless equipment through fan nozzlesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18025
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 890 (03/1999) . - p. 37-50[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 009604 - Périodique Bibliothèque principale Documentaires Exclu du prêt Surfactant behavior and its influence on the viscosity of associative thickeners solutions, thickened latex dispersions, and waterborne latex coatings / David M. Mahli in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 938 (03/2003)
[article]
Titre : Surfactant behavior and its influence on the viscosity of associative thickeners solutions, thickened latex dispersions, and waterborne latex coatings Type de document : texte imprimé Auteurs : David M. Mahli, Auteur ; Mark J. Steffenhagen, Auteur ; Lin-lin Xing, Auteur Année de publication : 2003 Article en page(s) : p. 39-51 Note générale : Bibliogr. Langues : Américain (ame) Tags : Acrylique dérivé polymère Hydrophobisation Ethylène oxyde Agent surface Epaississant Adjuvant Viscosité Propriété rhéologique Formulation Peinture émulsion eau Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Surfactants, varying in their chemical composition and hydrophobic behavior, are used in the formulation of a waterborne coating. These differences influence their aggregation in micellar structures, their interaction with associative thickeners, and in particular, the synergies present in their competitive adsorptions on the disperse phases in a waterborne coating. Adsorption of HEUR thickeners on latexes and the ability of surfactants to displace them from those surfaces is an important variable in the dispersion's viscosity. With large particle latexes, viscosity increases arise primarily from the network built through the interaction of HEURs with surfactants in the aqueous phase. Fluorescence is used to verify the mechanism by which surfactants enhance associative thickener viscosities. That is best achieved with nonionic surfactants, because of their synergies with large hydrophobe HEURs at low concentration. With decreasing latex particle size the adsorbed species is an important contributor to the dispersion's viscosity through its contribution to the latex's effective volume fraction increase and when the size of the adsorbed HEUR is matched to the separation distances of the latex at 0.25 volume fraction. Achieving controlled shear-thinning behavior in small particle size latex paints with the economic constraints on the amount of HEUR required to obtain 90 KU viscosities are discussed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5595
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Code-barres Cote Support Localisation Section Disponibilité 000563 - Périodique Bibliothèque principale Documentaires Disponible